CloneZilla is a OpenSource software for cloning disc, just like Norton Ghost®, and its OpenSource counterpart, Partition Image.
Multicast is supported in Clonezilla SE, which is suitable for massively clone. You can also remotely use it to save or restore a bunch of computers if PXE and Wake-on-LAN are supported in your clients.
By using another free software drbl-winroll, the hostname, group, and SID of cloned MS windows machine can be automatically changed.

There´s also an LiveCD with CloneZilla available here